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Texas Instruments VCA2615PFBR
- Part No.:
- VCA2615PFBR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 48-TQFP
- Datasheet:
-
VCA2615PFBR.pdf
- Description:
- IC VARIABLE GAIN 2 CIRC 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,908
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Product details
Overview
VCA2615PFBR from Texas Instruments is a dual-channel, low-noise variable-gain amplifier integrating a programmable Low-Noise Preamplifier (LNP) and a linear-in-dB VGA. It delivers 0.7nV/√Hz input-referred noise, 42MHz bandwidth, 52dB gain control range, ±0.33dB channel-to-channel gain matching, and operates from a single +5V supply. It is engineered for ultrasound receive-path signal conditioning in medical imaging systems.
For engineers reviewing the VCA2615PFBR datasheet, VCA2615PFBR pinout, VCA2615PFBR application, or VCA2615PFBR equivalent, this page provides verified technical context, real-world design meaning of key specs, TQFP-48 package details, ultrasound-specific application cards, and two validated alternative parts with functional and layout implications.
Technical Context
The VCA2615PFBR implements a cascaded LNP–VGA architecture: the LNP offers four discrete gain settings (3/12/18/22dB), active termination via four programmable feedback resistors (130Ω to 1500Ω), and differential buffered outputs for CW processing or direct VGA feeding. Its input impedance is digitally tunable without external components.
The VGA features linear-in-dB gain control (22dB/V), 0.2V–2.5V VCNTL range, switchable 0/+6dB post-gain mode, and adjustable output clipping via VCLMP (0.25–2.6V). Both channels share the same VCNTL and H/L control, enabling synchronized gain scaling and output swing optimization for ADC interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Noise Density | 0.7nV/√Hz - Enables high-SNR reception of weak ultrasound echoes below −90dBm. |
| Bandwidth | 42MHz - Supports wideband imaging up to 15MHz transducer fundamentals with >3dB flatness. |
| Gain Control Range | 52dB - Covers dynamic range from near-field strong echoes to far-field weak signals in B-mode scanning. |
| Channel Matching | ±0.33dB gain error - Ensures consistent beamforming across 64+ channel arrays without per-channel calibration. |
| Supply Voltage | +5V single supply - Simplifies power delivery in portable and cart-based ultrasound systems. |
| Power Dissipation | 154mW/channel - Allows dense integration in multi-channel front-end ASIC replacements with thermal headroom. |
| Clipping Threshold | Adjustable 0.25–2.6V via VCLMP - Prevents ADC saturation during probe ring-down or motion artifacts. |
Pinout & Package
TQFP-48 (7mm × 7mm, 0.5mm pitch), rated for −40°C to +85°C ambient operation. Thermal pad not present (unlike QFN variant); standard PCB land pattern required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCAIN+A / VCAIN−A VCAIN+B / VCAIN−B |
Differential VGA Inputs | Accept externally selected signals (via VCAINSEL) or internal LNP outputs; support SE or diff drive. |
| LNPOUT+A / LNPOUT−A LNPOUT+B / LNPOUT−B |
Differential LNP Outputs | Buffered outputs for off-chip CW processing or direct connection to VGA inputs-no AC coupling needed. |
| G1/G2, FB1–FB4 | LNP Configuration Inputs | Two-bit gain select (3/12/18/22dB); four-bit feedback resistor selection (130Ω–1500Ω) for active termination. |
| VCNTL, H/L | VGA Gain Control | Analog voltage (0.2–2.5V) sets VGA gain linearly; H/L selects +6dB or 0dB post-gain for ADC full-scale alignment. |
| VCLMP | Output Clamping Reference | Externally applied voltage defines differential output clipping threshold-critical for overload recovery in pulsed echo systems. |
| PDL / PDV | Power-Down Controls | Independent LNP (PDL) and VGA (PDV) shutdown reduce total power to 95mW or 236mW respectively. |
Key Features
| Feature | Design Value |
|---|---|
| Active Termination | Four programmable feedback resistors enable precise source impedance matching (130Ω–1500Ω), minimizing SNR loss to only 3dB vs conventional 6dB termination. |
| Linear-in-dB VGA | 22dB/V control slope ensures predictable, monotonic gain adjustment across 52dB range-essential for time-gain compensation (TGC) linearity. |
| Dual-Mode Post-Gain | H/L pin toggles between 0dB and +6dB VGA output gain, allowing one device to interface with both 10-bit and 12-bit ADCs without redesign. |
| Adjustable Output Clipping | VCLMP pin accepts 0.25–2.6V reference to set differential output clipping level-reduces recovery time after pulse transmit ring-down. |
| Channel-to-Channel Matching | ±0.33dB gain error at VCNTL = 0.4–2.0V enables coherent beamforming in 64+ element arrays without per-channel digital correction. |
Applications
| Medical Ultrasound B-Mode Imaging | Portable Ultrasound Handheld Systems |
|---|---|
|
Use Scenario: Real-time beamformed echo acquisition from 3–12MHz transducers in cart-based scanners. IC Role / Device Role / Timing Role: Dual-channel analog front-end (AFE) receive path: LNP conditions weak echo signals; VGA applies time-gain compensation (TGC) before ADC sampling. Use Value: 0.7nV/√Hz noise floor preserves contrast resolution for deep-tissue structures; 42MHz bandwidth supports harmonic imaging modes. |
Use Scenario: Battery-powered handheld devices requiring low-power, high-density AFE for point-of-care diagnostics. IC Role / Device Role / Timing Role: Integrated LNP+VGA replaces discrete gain stages, reducing component count and board area while maintaining SNR. Use Value: 154mW/channel power dissipation enables 32-channel integration within thermal limits; TQFP-48 allows standard reflow assembly. |
| Ultrasound Doppler Signal Processing | Industrial NDT Pulse-Echo Systems |
|
Use Scenario: Continuous-wave (CW) Doppler detection using phase-sensitive demodulation of reflected signals. IC Role / Device Role / Timing Role: Buffered LNP outputs feed external quadrature demodulators; differential VGA outputs maintain common-mode rejection. Use Value: Differential LNP outputs suppress power-supply noise; −70dBc crosstalk prevents channel leakage in multi-beam Doppler processing. |
Use Scenario: High-precision flaw detection in metal or composite materials using broadband pulsed transducers. IC Role / Device Role / Timing Role: Front-end amplifier for wideband echo amplification with adjustable gain and clipping to handle large near-surface reflections. Use Value: Programmable input impedance matches diverse transducer impedances (50Ω–1kΩ); adjustable VCLMP prevents ADC saturation during surface echo events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable-gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VCA2615RGZR | Same die, QFN-48 package with exposed thermal pad; 29.1°C/W θJA vs 58°C/W for TQFP. | Requires thermal via design; better suited for high-channel-count modules with aggressive thermal constraints. | Select VCA2615RGZR when board-level thermal management supports QFN soldering and thermal vias. |
| VCA2616PFBT | Architectural difference: attenuator + fixed-gain amp (not true VGA); higher 1.1nV/√Hz LNP noise; no active termination. | Lower cost but reduced SNR at low gains; unsuitable for high-resolution deep-tissue imaging. | Choose VCA2616PFBT only for cost-sensitive, lower-performance NDT or basic Doppler systems where 0.7nV/√Hz is not required. |
Compared with VCA2615PFBR, the VCA2615RGZR offers superior thermal performance in space-constrained layouts, while the VCA2616PFBT trades noise and flexibility for lower system cost-making VCA2615PFBR the optimal choice for clinical-grade ultrasound requiring best-in-class SNR and programmability.
Availability
VCA2615PFBR is available at Aetrix Electronics and suitable for medical ultrasound imaging, portable diagnostic equipment, and industrial non-destructive testing requiring stable component supply and long-term production continuity.
Supply support for VCA2615PFBR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in high-performance signal chain solutions.
The VCA2615 product line was designed specifically for ultrasound and high-fidelity medical imaging front-ends, emphasizing ultra-low noise, precise gain control, and integrated signal conditioning to replace multi-component discrete AFEs.
FAQ
What is the maximum input signal level the VCA2615PFBR can handle before overload?
The VCA2615PFBR supports up to 5VPP symmetrical clipping at any LNP gain setting, with linear operation ranging from 0.23VPP (22dB gain) to 2.3VPP (3dB gain). This wide input voltage range accommodates both near-field strong echoes and far-field weak signals without external attenuation, making it ideal for time-gain compensation in ultrasound systems using the VCA2615PFBR.
Does the VCA2615PFBR support differential input signals at the LNP stage?
Yes, the VCA2615PFBR accepts fully differential or single-ended inputs at the LNP stage. Its LNPIN+A/LNPIN−A and LNPIN+B/LNPIN−B pins are designed for true differential operation, which reduces second-harmonic distortion and improves common-mode noise rejection-key advantages confirmed in the VCA2615PFBR's −55dB harmonic distortion specification at 5MHz.
How does the active termination feature of the VCA2615PFBR improve system noise performance?
The VCA2615PFBR's active termination uses four programmable feedback resistors (130Ω–1500Ω) to match source impedance without 6dB SNR loss typical of passive 50Ω termination. By achieving only 3dB SNR penalty, the VCA2615PFBR preserves more signal integrity-directly enabling its 0.7nV/√Hz input-referred noise performance in real-world transducer interfaces.
Can the VCA2615PFBR be used with both 10-bit and 12-bit analog-to-digital converters?
Yes, the VCA2615PFBR's H/L pin selects between 0dB and +6dB post-VGA gain, allowing output swing optimization for different ADC resolutions. At +6dB mode, the VCA2615PFBR delivers full-scale differential output for 12-bit ADCs; at 0dB, it aligns with 10-bit ADC input ranges-enabling one VCA2615PFBR design to serve multiple product tiers.
What is the purpose of the VCLMP pin on the VCA2615PFBR, and what voltage range is supported?
The VCLMP pin on the VCA2615PFBR sets the differential output clipping threshold, with a supported range of 0.25V to 2.6V. Applying an external reference here defines the output voltage limit, accelerating overload recovery after transmit pulse ring-down-a critical capability for real-time ultrasound imaging where rapid echo acquisition follows each pulse, and the VCA2615PFBR's 25ns overload recovery time depends on proper VCLMP configuration.
VCA2615PFBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 2
- Output Type:
- Differential
- Slew Rate:
- 100V/µs
- Gain Bandwidth Product:
- 42 MHz
- -3db Bandwidth:
- 50 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- -
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 4.75 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFP (7x7)
VCA2615PFBR FAQ
1.How can I place an order for VCA2615PFBR through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA2615PFBR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for VCA2615PFBR reliable?
The price and inventory of VCA2615PFBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA2615PFBR is usually 5 days.
3.What payment methods are accepted for VCA2615PFBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA2615PFBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA2615PFBR?
VCA2615PFBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA2615PFBR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for VCA2615PFBR?
For technical support, including VCA2615PFBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA2615PFBR requirements.
6.How does Aetrix verify that VCA2615PFBR is sourced from the original manufacturer or authorized distributors?
All VCA2615PFBR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that VCA2615PFBR meets industry standards.
7.What is the process for return or replacement of VCA2615PFBR?
All VCA2615PFBR units undergo pre-shipment inspection (PSI). If there is an issue with VCA2615PFBR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The VCA2615PFBR part is unused and in its original packaging.
Return procedure for VCA2615PFBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VCA2615PFBR Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
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LM324PWR
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LM2902PWR
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LM2902DR
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LM358P
Texas Instruments
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